Indebtedness (Details Textual)	12 Months Ended				0 Months Ended		1 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Mar. 31, 2013 USD ($)	Mar. 01, 2013 6.0% Senior notes due 2013 USD ($)	Mar. 04, 2008 6.0% Senior notes due 2013 USD ($)	Dec. 31, 2008 6.875% Senior notes due 2018 USD ($)	Dec. 31, 2013 6.875% Senior notes due 2018 USD ($)	Dec. 31, 2012 6.875% Senior notes due 2018 USD ($)	Mar. 04, 2008 6.875% Senior notes due 2018 USD ($)	Dec. 31, 2013 Note payable to Fumedica USD ($)	Dec. 31, 2013 Note payable to Fumedica CHF	Dec. 31, 2012 Note payable to Fumedica USD ($)	Dec. 31, 2012 Note payable to Fumedica CHF	Dec. 31, 2006 Note payable to Fumedica CHF	Dec. 31, 2012 Cambridge Leases USD ($)
Debt Instrument
Principal amount of senior notes						$ 450,000,000				$ 550,000,000
Interest rate on senior notes						6.00%				6.875%
Redemption percentage par value of senior notes						99.886%				99.184%
Percentage of redemption of notes	100.00%
Increased carrying amount of interest rate swap							62,800,000
Interest to be amortized on debt	32,400,000
Repayments of borrowings	452,340,000	2,428,000	11,459,000		450,000,000
Notes payable and other financing arrangements	567,900,000							580,100,000	586,400,000		12,300,000		14,500,000		61,400,000
Present value of notes payable											15,800,000	14,000,000	17,900,000	16,400,000
Senior unsecured revolving credit facility maximum borrowing capacity				750,000,000
Credit facility, amount outstanding	0	0
Remaining obligation of financing arrangements																$ 86,500,000
Debt Instrument, Payment Terms	100% of the principal amount plus accrued interest and a specified make-whole amount